deps: Update titan.TestPorts.UNIX_DOMAIN_SOCKETasp_commit

The osmocom fork of the titan.TestPorts.UNIX_DOMAIN_SOCKETasp master
branch has been force-pushed in order to incorporate patch review
comments from upstream TITAN.

Change-Id: I23ec12fa5fb30796f37257cf5ea3fcd74d3ecb80
diff --git a/deps/Makefile b/deps/Makefile
index 46698e0..d1545fd 100644
--- a/deps/Makefile
+++ b/deps/Makefile
@@ -88,7 +88,7 @@
 titan.TestPorts.TCPasp_commit=			R.9.A
 titan.TestPorts.TELNETasp_commit=		R.9.A
 titan.TestPorts.UDPasp_commit=			R.8.A
-titan.TestPorts.UNIX_DOMAIN_SOCKETasp_commit=	R.2.A-4-g63d4ee3
+titan.TestPorts.UNIX_DOMAIN_SOCKETasp_commit=	R.2.A-4-gbacd73d
 
 all: $(foreach dir,$(ALL_REPOS),$(dir)/update)
 clean: $(foreach dir,$(ALL_REPOS),$(dir)/clean)